Which of the following is the formula of the iron ore haematite?

$(a)$ Show the formation of $MgO$ by the transfer of electrons.
$(b)$ Name the cation and anion.
$(c)$ Write three properties of ionic compounds.

Which among the following statements is incorrect for magnesium metal?

What are the constituent elements of Magnalium?

An electrolytic cell consists of:
$(i)$ Positively charged cathode
$(ii)$ Negatively charged anode
$(iii)$ Positively charged anode
$(iv)$ Negatively charged cathode

Which of the following ores is in the form of carbonate?